UIUtils.java 文件源码

private static void keepFocusedComponentVisible(Component component, FocusListener l) {
    component.removeFocusListener(l); // Making sure that it is not added twice
    component.addFocusListener(l);
    if (component instanceof Container) {
        for (Component subComponent : ((Container)component).getComponents()) {
            keepFocusedComponentVisible(subComponent, l);
        }
    }
}